Sorry if I offended you, I was not pointing a finger at you or your lab as I have never seen your work. I was being very general in nature based on my observations. If you are waxing out undercuts and do a perfect job the model won't break right? In the real world models break, acrylic is over extended pontics don't draw perfectly. A dup model will solve all of these issues.
If your clients or any client for that matter takes more than 5 minutes to deliver a retainer then something is wrong. I just choose to cover all my bases as I am certainly prone to not getting every undercut perfectly blocked out.
It is just how we do things, not that its the only way just the way I choose to do it.
As for the idea that we can blatantly move teeth with a spring retainer your right, it has to be with in reason. Some times it takes two appliances to get the teeth where they are desired.
As for cost, being that I run a full service lab and ortho appliances are the smallest part of my business I charge a premium to handle these cases.
A spring retainer done the way I outlined with 4 reset teeth with dup models is $135. Standard Hawley retainer $55 Wrap around $85. So you see I am not worried about making a dup.
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